It's Father's Day and Isabella decides to give Phineas a sexy surprise wake-up call, but that's not the only surprise she's got for him.

When Phineas and the gang go to high school, things start to change for our favorite animated couple. Follow Isabella Garcia-Shapiro as she navigates high school life, the Fireside Girls, and her oblivious best friend. Rating subject to change. Multiple pairings enclosed. Non-Canon Compliant. Highschool!Phineas and Ferb.

Summer is over. Isabella is complaining about not aving confessed to Phineas. On first day of school, she decided to tell him her feeling. But she founfd out it isn't easy when the boy being so oblivious and her friends constantly getting in her way. And Dr. Doofenshmirtz's new -inator do not help her.

After a brutally long day, Isabella's state could be summed up in three words: tired, stressed, and horny. Thankfully, when she gets home, Phineas has a solution for all three.

Over the past year, a certain red-headed inventor has had strange feelings for his best friend. One night, sitting in his favorite tree, Phineas resolves not to come down until he has puzzled out these strange feelings by looking back over the past year. K plus because there's no reason to rate it higher. Now complete!

sometimes it's better to keep something a secret, sometimes it's better to tell someone that there best friend has a crush on them, but it's always better to stop someone from announcing that Isabella has a crush on someone over the loud speaker, especially since more than 80% the boys at school have a crush on her … Yet for some reason none of them know who she has a crush on.

At the end of It's Complicated, Phineas and Isabella got together again in Boston. Now, they need to balance renewing their relationship with the demands of college life and the lack of privacy involved in shared dorm rooms. Making it work may be harder than they'd thought. Rated M for language and nonexplicit sexual conduct. Trope bingo: virginfic, first time/last time.

Isabella's moving away, and Phineas decides to break up with her so she can find somebody new in Albuquerque. Follow their last two years of high school on Facebook in this teenage Phinbella one-shot.

When Phineas accidentally discovers a not-so-private secret about Isabella, what will he plan to do with and for her before Christmas? A jam-packed Phinbella fluff and romance story filled with an Astronomy project, a dance, school, Christmas, and a million other things left to be discovered. Actual length: 36,700 words.

Phineas is stuck in the airport by a sudden snowstorm, but a chance encounter with his ex-girlfriend Isabella may make the whole experience worthwhile after all. Phinbella fluff one-shot, flip side of "Storm Warning". Trope bingo: snowed in.